Why aren't 135mm forks more popular on 26" SS bikes?

I've never seen it done before, but I've always wanted to do it. If my 1x1 didn't have a suspension fork I'd be running a very different setup. 135mm Pugsley fork with a Surly fixed hub front wheel and Surly freewheel hub rear wheel. Same size disc rotors and cog/freewheel so a wheel swap would be painless. There's numerous times when I'm riding my SS and have an urge to do a lap fixed or vice versa, but I can't because they are two different bikes. Does anybody else think this would be a fun idea? I see all the benefits of having a second "rear" wheel on the front for Pugsleys, why not Trolls or 1x1s? It doesn't even have to be a Surly..really just about any 26" rigid bike would work as long as the AC length of the Pugs fork cooperates with the frame.

Sure some of gone for a custom fork, but most would just use a Pug fork or other brand, and there are more fatbikes nowdays so a bit more choice in aftermarket rigid forks.

I suppose it's just a small element of people that want it and they can do it fairly easy anyway.

Not quite the same thing but similar train of thought, i up till now have run track hub wheel set on my KM so rim brakes, run a freewheel and also a fixed sprocket in case the freewheel decides to die i can still ride home, so far haven't needed it, will miss it when i get a proper 29er wheelset this year on a freehub hub with disc only rims.

Thinking back, current freewheel has gone wrong once due to grease in a warm climate (south of UK) then going tacky when up in Scotland (much cooler climate), and had one freehub lock up to fixed and another let go to no drive. Then again losing drive here means a bit of a walk, but we don't have to worry about being killed to death by Bears or eaten by Wolves, herds of cows can get a bit over curious and chase you, but your never too far from help or help getting to you.
If i ever get round to bikepacking will most likely run v-brake and rear track hub for the dual drive choice if freewheel dies in action.

I've never seen it done before, but I've always wanted to do it. If my 1x1 didn't have a suspension fork I'd be running a very different setup. 135mm Pugsley fork with a Surly fixed hub front wheel and Surly freewheel hub rear wheel. Same size disc rotors and cog/freewheel so a wheel swap would be painless. There's numerous times when I'm riding my SS and have an urge to do a lap fixed or vice versa, but I can't because they are two different bikes. Does anybody else think this would be a fun idea? I see all the benefits of having a second "rear" wheel on the front for Pugsleys, why not Trolls or 1x1s? It doesn't even have to be a Surly..really just about any 26" rigid bike would work as long as the AC length of the Pugs fork cooperates with the frame.

There are other photos out there somewhere. I would have to check out the Axle to crown measurements but that might be doable on a KM as well, although for the cost involved i will stay with my rim brakes and double fixed track hub.
Dosen't hurt to explore these ideas.
Watched one of the Alaskan bikepacking and rafting films last year, one of the Pugs was running low fixed gear and no brakes, may also have had a freewheel in the mix too, set up chosen as no hills and as simple a set up with bail out choice's if the chain snaps and gets cut and shut shorter, 2 wheels both with 2 sprocket sizes, so 4 chances if something fails.